last day of the year a species sings or chirps
Technical term used in phenology and nature observation, often contrasted with 初鳴日 (first day of singing). Refers to the final date in a calendar year on which a particular bird or insect species is heard vocalizing.
See also: 初鳴日
The last day the bush warbler sang this year was October 15th.
The meteorological observatory records the last day cicadas are heard.